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TPS730: TPS730

ANURAJ NK
Intellectual 510 points
Part Number: TPS730

Hi,

   The block dig arm of TPS730  has one 59K pull down at the output. is it for discharging the output voltage when LDO is disabled?

   

Can I test this resistor value as per below procedure.

1. Put LDO to shutdown more (EN=0)

2. Force voltage to output and measure current and calculate the resistance from this value.

Regards

Anuraj

  • 0
    TI__Expert 4350 points
    Hi Anuraj,

    The internal 59 kohm on OUT in the adjustable version LDO provides a minimum load current to the LDO. 59 kohm will sink 85 uA when OUT = 5 V. It will slowly discharge the output when the LDO is disabled.

    Yes, your idea will work to test the internal resistor value. Note that 59 kohm is typical value. Remember to subtract Ifb (feedback current) and current through R1 and R2 from your measured current into OUT.

    Take care to ensure the following during your test:
    Vout < 5 V, Vin < 5.5 V,
    Vin > Vout to prevent reverse current from OUT to IN.